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Net Earnings (Loss) Per Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Net Earnings (Loss) Per Share | (8) Net Earnings (Loss) Per Share The calculations of net earnings (loss) per share - basic and net earnings per share - diluted were as follows:
|  | 3 Months Ended |  |  | 9 Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Net earnings (loss) available to common shareholders |  | $ | 10.3 |  |  | $ | 146.1 |  |  | $ | (52.4 | ) |  | $ | 326.9 |
Weighted-average common shares outstanding (in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic |  |  | 58.2 |  |  |  | 59.9 |  |  |  | 58.4 |  |  |  | 60.2 |
Effect of dilutive securities - stock options |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |
Effect of other share-based awards |  |  | 0.3 |  |  |  | 0.3 |  |  |  | — |  |  |  | 0.3 |
Weighted-average common shares outstanding - diluted |  |  | 58.5 |  |  |  | 60.3 |  |  |  | 58.4 |  |  |  | 60.6 |
Net earnings (loss) per share - basic |  | $ | 0.18 |  |  | $ | 2.44 |  |  | $ | (0.90 | ) |  | $ | 5.43 |
Net earnings (loss) per share - diluted |  | $ | 0.18 |  |  | $ | 2.42 |  |  | $ | (0.90 | ) |  | $ | 5.40 |
Due to the net loss for the nine months ended September 30, 2020, the assumed exercise of share-based awards had an anti-dilutive effect and therefore was not included in the calculations of net loss per share – diluted for the nine months ended September 30, 2020. There were 0.7 million and 0.4 million share-based awards excluded from the calculation of net earnings per share - diluted for the three months ended September 30, 2020 and 2019, respectively, and 1.5 million and 0.4 million share-based awards excluded from the calculation of net earnings (loss) per share - diluted for the nine months ended September 30, 2020 and 2019, respectively, because their impact was anti-dilutive.

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